﻿#define _CRT_SECURE_NO_WARNINGS 
#include"Tree.h"

//前序遍历
void PreOrder(BTNode* root)
{
	if (root == NULL)
	{
		return;
	}
	printf("%d ", root->data);
	PreOrder(root->left);
	PreOrder(root->right);
}
//中序遍历
void InOrder(BTNode* root)
{
	if (root == NULL)
	{
		return;
	}
	PreOrder(root->left);
	printf("%d ", root->data);
	PreOrder(root->right);
}
//后序遍历 
void PostOrder(BTNode* root)
{
	if (root == NULL)
	{
		return;
	}
	PreOrder(root->left);
	PreOrder(root->right);
	printf("%d ", root->data);
}

// ⼆叉树结点个数
int BinaryTreeSize(BTNode* root)
{
	if (root == NULL)
	{
		return 0;
	}
	return 1 + BinaryTreeSize(root->left) + BinaryTreeSize(root->right);
}

// ⼆叉树叶⼦结点个数
int BinaryTreeLeafSize(BTNode* root)
{
	if (root == NULL)
	{
		return 0;
	}
	if (root->left == NULL && root->right == NULL)
	{
		return 1;
	}
	return BinaryTreeLeafSize(root->left) + BinaryTreeLeafSize(root->right);
}

// ⼆叉树第k层结点个数
int BinaryTreeLevelKSize(BTNode* root, int k)
{
	if (root == NULL)
	{
		return 0;
	}
	if (k == 1)
	{
		return 1;
	}
	return BinaryTreeLevelKSize(root->left, k - 1) + BinaryTreeLevelKSize(root->right, k - 1);
}

//⼆叉树的深度/⾼度
int BinaryTreeDepth(BTNode* root)
{
	if (root == NULL)
	{
		return 0;
	}
	int leftDep = BinaryTreeDepth(root->left);
	int rightDep = BinaryTreeDepth(root->right);
	return leftDep > rightDep ? leftDep + 1 : rightDep + 1;
}

// ⼆叉树查找值为x的结点
BTNode* BinaryTreeFind(BTNode* root, BTDataType x)
{
	if (root == NULL)
	{
		return 0;
	}
	if(root->data==x)
	{
		return root;
	}
	BTDataType* leftfind = BinaryTreeFind(root->left, x);
	if (leftfind == NULL)
	{
		return leftfind;
	}
	BTDataType* rightfind = BinaryTreeFind(root->right, x);
	if (rightfind)
	{
		return rightfind;
	}
	return NULL;
}

void BinaryTreeDestory(BTNode** root)
{
	if (*root == NULL)
	{
		return;
	}
	BinaryTreeDestory(&((*root)->left));
	BinaryTreeDestory(&((*root)->right));

	free(*root);
	*root = NULL;
}

//层序遍历
void LevelOrder(BTNode* root)
{

}
